Square edge sign holder



FIG. 1 is a perspective view of a square edge sign holder showing my new design;

FIG. 2 is a right side elevational view thereof, with a left side elevational view being a mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a left end elevational view thereof, with a right end elevational view being identical thereto. 

The ornamental design for a square edge sign holder, as shown and described. 